Configuring Qt for your Raspberry Pi

Hello guys,
After downloaded my Raspberry Pi for Qt on qtrpi.com , I try to follow the step on wiki.qt.io/RaspberryPi2EGLFS, on the step 3 update your RPI
sudo rpi-update
reboot
the terminal said rip-update: command no found
the following step are the same . how can i do before to playing with it in Qt Creator? Thank you for your help